plastic ones the cinema give you
real 3d
The plastic clear cover on a watch is called a protective film. It is used to keep the glass face plate from getting scratches or getting damaged or cracked. ADDED: The first answer is referring to the protective film applied at the factory which protects the watchface "glass faceplate" lens. The name of the glass faceplate is called the "BEZEL." ANOTHER ANSWER: The glass that covers the watch face is also called a crystal.
Glass was used before film was invented.
i think a test tube
watch glass?
The type of glass most commonly used is Plexiglas which is an acrylic polymer. Another type used as an alternative to Plexiglas is polycarbonate.
A watch glass is a very shallow, round piece of glass that is curved. It is usually not used as a container, but as a cover for a beaker.
Glass was used as a lens protector. Now we use plastic.
Gorilla Glass IS USED.
A watchglass can be used as a beaker cover, but you can also place small amounts of chemicals on it and then heat it (for example, to evaporate some water from a wet chemical).From Wikipedia:A watch glass is a circular, slightly concave piece of glass used in chemistry as a surface to evaporate a liquid, or as a cover for a beaker. The latter use is generally applied to prevent dust or other particles entering the beaker; the watch glass does not completely seal the beaker, and so gas exchanges still occur. When used as an evaporation surface, a watch glass allows closer observation of precipitates or crystallisation, and can be placed on a surface of contrasting colour to improve the visibility overall. Watch glasses are so named because they are identical to the glass used for the front of old-fashioned pocket watches. In reference to this, large watch glasses are occasionally known as clock glasses.See the Related Questions and Web Links to the left for a picture of watch glass and more information about other laboratory apparatus.
They were used in catherdals and they were used to watch Netflix
You think probable to a watch glass - a piece similar to small saucer, used in laboratory.